A point source emits sound waves isotropically. The intensity of the waves 4.50 m from the source is 1.51 ✕ 10−4 W/m2. Assuming that the energy of the waves is conserved, find the power of the source?

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion